upgrade Rubocop & drop Ruby 2.4.x support (#2190)

* upgrade Rubocop & drop Ruby 2.4 support To use latest Rubocop we need to drop support for Ruby 2.4.x. Also, this change fixes some offenses with auto correction. * next version will be 1.6.0
ruby-grape · Sep 27, 2021 · f5d9831 · f5d9831
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diff --git a/.rubocop.yml b/.rubocop.yml
@@ -1,6 +1,6 @@
 AllCops:
   NewCops: enable
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.5
   SuggestExtensions: false
   Exclude:
     - vendor/**/*